JP3906100B2 - Stir mixer for lining equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stirring mixer used for a lining apparatus for transporting a cement-based lining material such as concrete or mortar at high pressure with compressed air and spraying it with an injection nozzle to line a drilling wall such as a tunnel or shaft.
[0002]
[Prior art]
This type of lining device, for example, as a tunnel lining device shown in FIG. 1, is equipped with various equipment necessary for spraying a concrete pump 2, a compressor 3, a quick setting agent supply machine 4, etc. In addition, an injection nozzle 7 is attached to the tip of the extendable boom 5 via a slide and turnable attachment 6, and the concrete pump 2 and the injection nozzle 7 are connected by a pressure feed pipe 8 and provided in the middle of the pressure feed pipe 8. The quick setting agent supply port 9 is connected to the quick setting agent supply machine 4.
[0003]
In the lining device, the lining material supplied to the concrete pump 2 by the concrete mixer truck is high-pressure transported to the injection nozzle 7 by the pressure feed pipe 8 using the compressed air from the compressor 3, and from the quick setting agent supply machine 4. The powdered quick-set agent is injected from the quick-set agent supply port 9 into the press-feed pipe 8, and the mixed lining material and the quick-set agent are sprayed from the spray nozzle 7 onto the excavation wall surface.
[0004]
In the case of spraying by this pneumatic feeding method, there are advantages such as high construction efficiency and relatively inexpensive equipment, but since the lining material and quick setting agent are mixed in the narrow pumping pipe 8. Some of the quick-setting agents that are imperfectly mixed may be discharged from the spray nozzle 7 in the form of a powder, or may be separated when suspended and scattered to the surroundings to cause dust pollution. In addition, there were also drawbacks such as inability to produce a good quality lining.
[0005]
Various studies have been made to eliminate these drawbacks.For example, the use of a liquid quick-setting agent has been attempted, but there are difficulties in quick-setting performance, and dust is generated by suction in the middle of the pumping pipe. There has also been a proposal to provide a dust removal pipe for removing the lining material, but this is not always a sufficient solution, such as clogging of the lining material, or the possibility that the lining material may remain when the supply is stopped or stopped.
[0006]
On the other hand, in order to eliminate these drawbacks, the present applicants centrifugally project the lining material using an impeller that rotates at high speed without spraying, as disclosed in JP-A-10-2198. At the same time, a series of proposals have been made on a lining apparatus for mixing a lining material and a quick setting agent by using a stirring and mixing means in which a large number of stirring rods are projected from the outer periphery of a rotating shaft along an axis.
[0007]
According to these lining devices, it is possible to obtain a lining material in which the lining material and the quick setting agent are mixed, and to obtain a good lining with less dust and rebound. Excellent performance can be expected, but the disadvantage is that it is slightly inferior in construction efficiency compared with the case of spraying by pneumatic feeding method, and since it is not possible to use the commonly used pneumatic feeding method spraying equipment, purchase newly Equipment costs to do this.
[0008]
[Problems to be solved by the invention]
Therefore, in the present invention, a stirring mixer for a lining apparatus that can solve the problems of the lining apparatus according to the above-described prior art, and in particular, it is implemented at a low cost by using a generally widely used pneumatic equipment spraying equipment as it is. It is possible to provide a stirring mixer that can be expected to obtain a good lining with less dust and rebound by mixing and stirring the lining material and the quick setting agent.
[0009]
[Means for Solving the Problems]
A stirring mixer for a lining device according to the present invention includes a casing in which a vertically placed cylindrical upper side and a funnel-shaped lower side are continuously provided, and a large number of outer circumferences of a rotating shaft along an axis are provided in the casing. An agitation / mixing means is provided with an agitating rod projecting, and a first introduction port for introducing a low-pressure lining material and a second introduction port for introducing a high-pressure powdery accelerating agent are provided on the upper outer periphery of the casing. Then, the quick setting agent introduced while stirring the lining material that freely flows through the casing with the stirring rod is stirred and mixed.
[0010]
Further, a third inlet for introducing high-pressure compressed air for conveyance along the funnel-shaped inner surface is provided on the lower outer periphery of the casing, and a discharge port is provided at the lower end side axial center of the casing to mix and stir the lining material. And high-pressure transport from the discharge port while accelerating with the compressed air for conveyance with the rapid setting agent introduced.
[0011]
The stirring mixer for a lining apparatus according to the present invention is a lining in which a casing is formed of a vertical cylindrical body, and the lining material does not remain inside even when the operation is stopped or stopped, and adheres to the inner surface of the casing. Since the material is scraped off at the tip of the stirring rod, the work after resumption can be performed in a good state without the lining material staying or clogging, and the frequency of maintenance such as internal cleaning can be reduced.
[0012]
In addition, the quick setting agent cannot be sufficiently stirred and mixed in the lining material in a narrow pumping pipe as in the prior art, but with this stirring mixer, sufficient stirring and mixing can be performed in a wide casing, and the filling state If a large space is stirred instead of a coarse density, the rapid setting agent is actively mixed with the lining material, and a uniform mixed state can be obtained even with a short flow distance.
[0013]
In particular, the lower casing is formed in a funnel shape in order to make a transition from a wide space to a narrow pumping pipe. In this case, the lining material usually becomes a dumpling and may be blocked. It is possible to eliminate the state of dumpling by jetting the compressed compressed air for conveyance onto the inner surface of the plate, and to make the lining material introduced in an intermittent state into a fixed state and transport it to the pressure feed pipe at high pressure.
[0014]
In contrast to the conventional tunnel lining apparatus, the first introduction port and the discharge port are connected in the middle of the lining material pressure-feeding pipe provided between the concrete pump and the injection nozzle, and the second quick-setting agent supply unit is connected to the second lining device. By connecting the introduction port to the compressor and the third introduction port, respectively, the stirring mixer according to the present invention can be easily added, and it is inexpensively provided as a new tunnel lining device that can produce a good quality lining with less dust. be able to.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a stirring mixer for a lining apparatus according to the present invention will be described in detail with reference to FIGS. 2 and 3 showing a preferred embodiment applied to a tunnel lining apparatus. FIG. FIG. 3 is a longitudinal sectional view of the agitating and mixing device 10, and the same members as those in the prior art of FIG. 1 are denoted by the same reference numerals and detailed description thereof is omitted.
[0016]
The stirring mixer 10 can be used by being attached to an appropriate position of the lining device. In the illustrated embodiment, the support bracket 11 is provided on the upper side of the stirring mixer 10 so as to interlock with the undulation or expansion / contraction of the boom 5. 11 are connected to the mounting bracket 12 provided on the boom 5 by a lifting tool 13 and suspended, but may be mounted on the traveling carriage 1 in a fixed state.
[0017]
The stirring mixer 10 has a first inlet 14 for introducing a low-pressure lining material from the concrete pump 2 via the pressure feed pipe 8A, and a powder pressure-fed from the quick setting agent feeder 4 via a pressure feed pipe (not shown). There are provided a second introduction port 15 for introducing a high-pressure quick-setting agent and a third introduction port 16 for introducing high-pressure compressed air for conveyance from the compressor 3 via a pressure feed pipe (not shown).
[0018]
The agitating mixer 10 is provided with a discharge port 17 that conveys the agitated and mixed lining material and the rapid setting agent to the injection nozzle 7 via the pressure feeding pipe 8B by the compressed air for conveyance, and the pressure feeding pipe from the compressor 3 is provided. It is also possible to adopt a form in which a compressed air supply port 18 for introducing compressed air for acceleration through (not shown) is provided in the middle of the pressure feed pipe 8B as necessary.
[0019]
These first to third inlets 14, 15, 16 and the discharge port 17 and the compressed air supply port 18 can be connected to each pressure feed pipe via a detachable connector, and is based on the prior art shown in FIG. Since the stirring mixer 10 to which the present invention is applied can be easily added to the tunnel lining apparatus, a new tunnel lining apparatus that can produce a good quality lining with less dust can be provided at low cost.
[0020]
Next, the details of the internal structure of the agitating mixer 10 will be described with reference to FIG. 10C, and a vertical cylindrical upper casing 19a that accommodates most of the stirring and mixing section 10B, and a lower casing 19b that is funnel-shaped and accommodates a part of the stirring and mixing section 10B. A casing 19 is formed by wrapping and connecting.
[0021]
The rotary drive unit 10A has a motor 20 mounted on the upper end along the axis of the casing 19, and a bearing mechanism 22 is provided on the outer periphery of a connecting shaft 21 attached to the motor shaft. The flange 23 connected to the upper side casing 19a is detachably connected to the flange 24 provided at the upper end of the upper casing 19a by screw means 25. When the screw means 25 is removed, the internal mechanisms of the rotary drive unit 10A and the stirring and mixing unit 10B are removed from the casing 19. Is removable and is configured to be cleaned and replaced.
[0022]
The stirring and mixing unit 10B is connected to a rotating shaft 27 along the axis from a disk-shaped partition plate 26 attached to the lower end of the connecting shaft 21, and the rotating shaft 27 is a part accommodated in the upper casing 19a. Is formed in a cylindrical shape having the same diameter, and a portion protruding into the lower casing 19b is formed in a truncated cone shape that gradually decreases in diameter.
[0023]
The rotating shaft 27 is provided with a large number of stirring rods 28 protruding from the outer periphery at circumferential intervals and at regular intervals in the axial direction, and the tips of the stirring rods 28 are located close to the inner wall surfaces of the upper casing 19a and the lower casing 19b. It is possible to scrape the lining material adhering to the inner wall surface and the rotating shaft 27 and the stirring rod 28 form stirring and mixing means.
[0024]
The mounting interval and the extending direction of the stirring rod 28 can be arbitrarily set as desired. However, in the illustrated embodiment, the stirring rod 28 protrudes in the horizontal direction at intervals of 90 degrees with respect to the circumferential direction. The first introduction port 14 is provided on the upper outer periphery of the upper casing 19a so that the introduced lining material can flow freely, and the powdery quick setting agent is sprayed on the lining material that flows freely. As described above, the second introduction port 15 is provided below the first introduction port 14.
[0025]
The air transport section 10C is arranged in such a manner that the upper opening of the lower casing 19b overlaps the lower outer periphery of the upper casing 19a, and a flange 29 provided at the upper end is provided in the middle of the upper casing 19a. The flange 30 is detachably connected to the screw means 31. When the screw means 31 is removed, the flange 30 can be removed from the upper casing 19a, and can be cleaned and replaced.
[0026]
The third introduction port 16 is provided on the outer periphery on the upper end side of the lower casing 19b that overlaps with the upper casing 19a, and is introduced via a slit-like ejection channel 32 formed along the circumference between them. The transported compressed air is jetted along the funnel-shaped inner peripheral surface 33 and is discharged from the discharge port 17 provided at the lower end side axis of the lower casing 19b.
[0027]
In the stirring mixer 10 having the above-described configuration, the outer periphery of the rotating shaft 27 driven to rotate by the motor 20 is stirred while the lining material introduced at a low pressure from the first inlet 14 freely flows through the upper casing 19a. The rod 28 is stirred and allowed to flow down in a coarse density state, and after being mixed with the powdery quick setting agent introduced from the second introduction port 15 at a high pressure, the high pressure introduction from the third introduction port 16 is carried out. Accelerated with compressed air and conveyed from the discharge port 17 at high pressure.
[0028]
According to the stirring mixer 10, the casing 19 is formed of a vertical cylindrical body, and even when the operation is stopped or stopped, the lining material does not remain inside, and the lining material adhering to the inner surface of the casing 19 is Since it is scraped off at the tip of the stirring rod 28, it is possible to perform the work after resumption in a good state without stagnation or blockage of the lining material, and the frequency of maintenance such as internal cleaning can be reduced.
[0029]
Further, the quick setting agent cannot be sufficiently stirred and mixed in the lining material in a narrow pumping pipe as in the prior art, but the stirring mixer 10 can perform sufficient stirring and mixing in a wide casing 19 and is filled. When a wide space is stirred in a coarse density state instead of a state, the rapid setting agent is actively mixed with the lining material, and a uniform mixed state can be obtained even with a short falling distance.
[0030]
In particular, the lower casing 19b is formed in a funnel shape in order to make a transition from the wide space to the narrow pumping pipe 8B again. However, in this case, there is a possibility that the lining material normally becomes a dumpling and becomes blocked. In addition to eliminating the dumpling state by jetting the compressed air for conveyance on the funnel-shaped inner surface, the lining material introduced in an intermittent state can be quantified and transported to the pressure-feeding pipe 8B at a high pressure.
[0031]
The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the gist. In the embodiment, the present invention is applied to a tunnel lining device. In the case of vertical shafts, it is possible to move up and down in the shaft and to hold it in a desired position in the same way as scaffolds or scaffolds on the ground or in vertical shafts. A stirring mixer 10 can be mounted on the table.
[0032]
In this case, for example, various parts necessary for spraying such as the concrete tank 2, the compressor 3 and the quick setting agent feeder 4 are mounted in any of the above-described places, and the elevator 5 corresponds to the boom 5 or the attachment 6. The injection nozzle 7 is mounted via the positioning mechanism, and the stirring mixer 10 is mounted in the middle of the pressure feed pipe 8 connecting the concrete pump 2 and the injection nozzle 7.
[Brief description of the drawings]
1 shows a tunnel lining device according to the prior art.
FIG. 2 is an explanatory diagram of a main part in which the stirring mixer of the present invention is applied to the tunnel lining apparatus shown in FIG.
FIG. 3 is a longitudinal sectional view of the entire stirring mixer according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Traveling trolley 2 Concrete pump 3 Compressor 4 Quick setting agent supply machine 5 Boom 6 Attachment 7 Injection nozzle 8, 8A, 8B Pressure feed pipe 9 Quick setting agent supply port 10 Stirring mixer 10A Rotation drive part 10B Stir mixing part 10C Air transport part 11 Support bracket 12 Mounting bracket 13 Suspension tool 14 First inlet (for lining material)
15 2nd introduction port (for powder quick setting agent)
16 Third inlet (for compressed air for conveyance)
17 Discharge port 18 Compressed air supply port 19 Casing 19a Upper casing 19b Lower casing 20 Motor 21 Connecting shaft 22 Bearing mechanisms 23, 24, 29, 30 Flange 25, 31 Screw means 26 Partition plate 27 Rotating shaft 28 Stirring rod 32 Jetting Flow path 33 Funnel-shaped inner peripheral surface

Claims (1)

A casing having a vertically arranged cylindrical upper side and a funnel-shaped lower side is provided, and stirring and mixing means in which a number of stirring rods project from the outer periphery of the rotating shaft along the axis is provided in the casing. A first introduction port for introducing a low-pressure lining material on the outer periphery of the upper side of the casing, and a second introduction port for introducing a high-pressure powder-like accelerating agent. The quenching agent introduced while stirring with a stirring rod is stirred and mixed, and a third introduction port for introducing high-pressure compressed air for conveyance along the funnel-shaped inner surface is provided on the lower outer periphery of the casing, and the lower end of the casing A stirrer / mixer for a lining apparatus, characterized in that a discharge port is provided in a side axis and the high-pressure transport is performed from the discharge port while accelerating with a compressed air for conveyance into which a stir-mixed lining material and a quick setting agent are introduced.

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